1 /*-
2 * Copyright (c) 2007-2008 John Birrell <jb@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/8.3/sys/kern/kern_dtrace.c 219107 2011-02-28 23:28:35Z rwatson $");
29
30 #include "opt_kdb.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/eventhandler.h>
35 #include <sys/kdb.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/proc.h>
39 #include <sys/dtrace_bsd.h>
40
41 #define KDTRACE_PROC_SIZE 64
42 #define KDTRACE_THREAD_SIZE 256
43
44 MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
45
46 /* Return the DTrace process data size compiled in the kernel hooks. */
47 size_t
48 kdtrace_proc_size()
49 {
50
51 return (KDTRACE_PROC_SIZE);
52 }
53
54 static void
55 kdtrace_proc_ctor(void *arg __unused, struct proc *p)
56 {
57
58 p->p_dtrace = malloc(KDTRACE_PROC_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
59 }
60
61 static void
62 kdtrace_proc_dtor(void *arg __unused, struct proc *p)
63 {
64
65 if (p->p_dtrace != NULL) {
66 free(p->p_dtrace, M_KDTRACE);
67 p->p_dtrace = NULL;
68 }
69 }
70
71 /* Return the DTrace thread data size compiled in the kernel hooks. */
72 size_t
73 kdtrace_thread_size()
74 {
75
76 return (KDTRACE_THREAD_SIZE);
77 }
78
79 static void
80 kdtrace_thread_ctor(void *arg __unused, struct thread *td)
81 {
82
83 td->td_dtrace = malloc(KDTRACE_THREAD_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
84 }
85
86 static void
87 kdtrace_thread_dtor(void *arg __unused, struct thread *td)
88 {
89
90 if (td->td_dtrace != NULL) {
91 free(td->td_dtrace, M_KDTRACE);
92 td->td_dtrace = NULL;
93 }
94 }
95
96 /*
97 * Initialise the kernel DTrace hooks.
98 */
99 static void
100 init_dtrace(void *dummy __unused)
101 {
102
103 EVENTHANDLER_REGISTER(process_ctor, kdtrace_proc_ctor, NULL,
104 EVENTHANDLER_PRI_ANY);
105 EVENTHANDLER_REGISTER(process_dtor, kdtrace_proc_dtor, NULL,
106 EVENTHANDLER_PRI_ANY);
107 EVENTHANDLER_REGISTER(thread_ctor, kdtrace_thread_ctor, NULL,
108 EVENTHANDLER_PRI_ANY);
109 EVENTHANDLER_REGISTER(thread_dtor, kdtrace_thread_dtor, NULL,
110 EVENTHANDLER_PRI_ANY);
111 }
112
113 SYSINIT(kdtrace, SI_SUB_KDTRACE, SI_ORDER_FIRST, init_dtrace, NULL);
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